Air-vent valve.



'PATENTED JAN. 29, 1907;

E. P. ALLEN.

AIR VENT VALVE.

APPLIUATION FILED MAY 19, 1902.

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dual '1? qyanrrn snares PATENT rrrcn EVERETT I ALLEN, oF oHIo'AGo, ILLINO IS,.ASSIGNOR TO ROMEO HWILBUR, TRUSTEE, or GHICAGQILLINOIS.

AIR-VENT VALVE.

Specification of Letters Patent.

Patented Jan. 29, 1967.

-Application filed May 19, 19 02. Serial in. 108.017-

l'n-rtli/ whom it 77ml concern Be it known that I, EVERETT P, ALLEN, a citizenof the United States, residing at Chicago, county of Cook, State of Illinois, have invented a certain new and useful Improve ment in Air-Vent Valves; and. I declare the following to bee full, clear, and exact descrip-v tion of the invention, such as willenable others skilledin the art to which it pertains tion of the valve with the float in its lower position, and Fig. 2 is a corresponding view with the float in its upper position.

In carrying out thcinvention'A represents a suitable casing to which is engaged the in let-nipple B, provided with screw threads,

whereby it may be, suitably secured to the radiator or other part of the system which it is desired to vent. In the upper end of the casing is a fitting D, having the outlet-port D.- Engaging the upper end of the fitting is a cap C, having a vent-orifice c.

E is the float, provided on its upper end with the valve e, adapted to close the outletport D; This float is preferably what is known in the art as a closed float-that is,

it is not raised by the expansion of air in or ad iacent. to the float, but is raised by what is irnouui 1n the art as flotatlon, and while I i prefer to make it a sealed shell, as shovm, it might be made in'other forms.

A is a cap engaged, preferably, by screw threads to close the lower end of the casingA Surrounding the casing A is a casing F, forming, together with the wall of the casing A, what I will hereinafter term the air-chamber F.

v a is a port connecting the lower end of the air -chamber.with the floatchamber A formed by the casing A, in which the float is located. r The 0 ieration of the valve will now be understoo The valve is secured to the radiator in the usual manner by screwing the part l hole in the wall of one of the radiator-coils.

No water need be placed in the valve prior to securing it to the radiator, and-consequently when the valve is rotated to secure the same to the radiator there is no danger of water flowing therefrom either to injure any objects or to interfere with the operation of the valve.

After applying the valve to the radiator the float rests by gravity upon the cap A, leavingthe outlet D open for air to be ejected from they system by the heating medium, such as-stoani. After the air has been ejected the accumulation of water of condensation within the floatchamber A lifts the float E and causes the valve (3 to close the outlet D, so that the escape of the heating medium ceases. The air within the chamber F is expanded by the heating medium and a part thereof passes through the port (1'.

When the heating medium is cut off from the radiator, the air within the chamber F becomes cool and by contraction is reduced in volume, so that the water within the floatchamber A? is drawn from such chamber into the lower-portion of the air-chamber, as shown in Fig. 1. v ,ter fronrthe float-chamber permits the float to fall from the position shown in Fig 2 to that shown in Fig. 1, thereby opening the outletD. Upon the heating medium being again admitted to the radiator it drives the air out of the outlet D; but such out-let is closed after the expulsion, ofthe air by the expansion of the air within the chamber F, due to the heat imparted thereto from the heating medium. within the chamber F forces the water from the lower part of such chamber through the port a into the float-chamber A and raises the float, so that the valve 6 will'close the outlet D. If the water within the lower part of the air-chamber F isniore than sufficient to reach the level shown in Fig. 2, the excess water returns to tl1e system, and if the expansion of the air within the chamber F causes its volume to exceed the space within such chamber the surplus air passes through the port a. Thefloat-chaniber A and air- The withdrawal of the wachamber F are so related in size that the contraction and ex ansion of the air within the air-chamber wilj so vary the level of the water within the float-chamber as to raise and lower the float, and thereby open and close B into the ordinary interiorlyscrew-threaded l the valve.

While I have described more or less precisely the details of construction, I do not wish to be understood as limiting myself thereto, as I contemplate changes in form, the proportion of parts, and the substitution of equivalents, as circumstances may suggest or render expedient without departin from the spirit of my invention.

What I claim is 1. In an,automatic vent-valve, the combination with a hollow casing, having an inlet leading directly thereto fromthe radiator, above the line of flotation thereof, and an outlet leading therefrom, the portion of said casing below the inlet forming a float-chamber, of a float located within said float-chamber and adapted to control said outlet, and an air-chamber in communication with said float-chamber near the bottom thereof, said chamber arranged to be heated by the heating medium from the radiator.

2. Ina valve, the combination with a casing having an inlet leading thereinto near the top'thereof, and an outlet leadin therefrom, of a closed float located within the casing below the inlet and adapted to open and close said outlet, and an air-chamber closed at its top and communicating with the casing at a point below said inlet.

3. In a valve, the combination with a casing having an inlet leading thereinto near the top thereof and an outlet leading therefrom,

of a closed float located within the casing belowthe inlet and adapted to open and close said outlet, and an air-chamber closed at its top extendlng from a point adjacent to the inlet and communicating near the bottom thereof with said casing.

4. In a valve, the combination with a'casing having an inlet leading thereinto above the bottom thereof and an outlet leading therefrom, of a closed float located within the float-chamber formed by the casin below the inlet and adapted to open and outlet; and'an air-chamber closed at its top located concentrically with respect to said close the i 'top,

outlet leading therefrom, of a float within said casing adapted to open and close the outlet, and an air-chamber concentrically surrounding said casing, said chamber being closed-at its top and conununirating with the casin at a point adjacent the lower end of said oat.

7; In an automatic vent-valve having an inlet and an outlet, the combination with a closed float for controllingthe outlet, of a casin forming a float-chamber within which said cat is located, a second casing surrounding andspaced apart from the first casing to form an air-chamber between said casings, means-for uniting the upper ends of said casings thereby closing the air-chamber at its said first casing having a port adjacent its lower end through which said float and air-chambers communicate.

8. In an automatic vent-valve having an inlet and an outlet, the combination with a float for controlling the outlet, of a floatchamber within which said fl'oat is located, an air-chamber closed at its top and surrounding said float-chamber, said chambers being in communication adjacent their lower ends.

In testimony whereof I sign this specification inthe presence of two witnesses.

EVERETT P. ALLEN.

Witnesses:

H. S. GAITHER, CLARA (I. CUNNINGHAM. 

